{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a"
            },
            {
              "fixed": "0e52886c4324c9897c2c62f92be3dc8316cee67e"
            },
            {
              "fixed": "a58024835c704419bb46d2a34e5223f65605f958"
            },
            {
              "fixed": "6fe5c3a2503983abb431d93faeadfc7f5e6a7e33"
            },
            {
              "fixed": "5c216bfa9fb7b36804485e67975e9c98055b31ef"
            },
            {
              "fixed": "161a403c8625e152de03d1da22bbf9cda6dc9f9f"
            },
            {
              "fixed": "a9ce4053dc945c5372dedba5017ee675b30dc0c5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.1.0"
            },
            {
              "fixed": "6.1.189"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.158"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.112"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.54"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98239.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: lan743x: fix RX checksum use-after-free\n\nlan743x_rx_process_buffer() adds each non-first receive buffer to the\nhead skb's frag_list.  On the last descriptor, lan743x_rx_trim_skb()\nlinearizes the head and frees the fragment skb metadata.\n\nThe checksum-success path then writes ip_summed through the local skb\npointer, which still points to the final fragment.  This causes a\nuse-after-free write when a packet spans more than one receive buffer.\n\nSet ip_summed on the surviving head skb instead.  Multi-buffer receive\ncan occur after a live MTU increase because existing ring entries keep\ntheir old buffer size until they are replenished.\n\nA KUnit test invoking lan743x_rx_process_buffer() with a two-buffer\npacket produced a one-byte KASAN use-after-free write before this change.\nThe same test passed after the change.  The driver object also builds\nwith W=1.  This was not tested on physical LAN743x hardware.",
  "id": "CVE-2026-98239",
  "modified": "2026-10-09T02:30:45.057088503Z",
  "published": "2026-10-06T08:45:10.611Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e52886c4324c9897c2c62f92be3dc8316cee67e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/161a403c8625e152de03d1da22bbf9cda6dc9f9f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c216bfa9fb7b36804485e67975e9c98055b31ef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6fe5c3a2503983abb431d93faeadfc7f5e6a7e33"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a58024835c704419bb46d2a34e5223f65605f958"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9ce4053dc945c5372dedba5017ee675b30dc0c5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98239.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98239"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net: lan743x: fix RX checksum use-after-free"
}